Extension Pack do not install from folder with cyrilic letters

Description

I downloaded
Oracle_VM_VirtualBox_Extension_Pack-4.0.0-69151.vbox-extpack
and tried to install them into VirtualBox-4.0.0-69151-Win.exe.
Install was failed with exit code 1.
The directory name from which I tried to install extention pack contain Cyrillic letters. When I move extension pack to folder with English letters it was installed successfully.